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firmware: arm_scmi: Use common iterators in the perf protocol

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Make SCMI perf protocol use the common iterator protocol helpers for
issuing the multi-part commands.

Link: https://lore.kernel.org/r/20220330150551.2573938-19-cristian.marussi@arm.com
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Cristian Marussi 2022-03-30 16:05:47 +01:00 • committed by Sudeep Holla
parent d8d7e91316
commit 79d2ea9244
1 changed files with 72 additions and 51 deletions
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123
drivers/firmware/arm_scmi/perf.c
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@ -272,66 +272,87 @@ static int opp_cmp_func(const void *opp1, const void *opp2)
return t1->perf - t2->perf;
}
struct scmi_perf_ipriv {
u32 domain;
struct perf_dom_info *perf_dom;
};
static void iter_perf_levels_prepare_message(void *message,
unsigned int desc_index,
const void *priv)
{
struct scmi_msg_perf_describe_levels *msg = message;
const struct scmi_perf_ipriv *p = priv;
msg->domain = cpu_to_le32(p->domain);
/* Set the number of OPPs to be skipped/already read */
msg->level_index = cpu_to_le32(desc_index);
}
static int iter_perf_levels_update_state(struct scmi_iterator_state *st,
const void *response, void *priv)
{
const struct scmi_msg_resp_perf_describe_levels *r = response;
st->num_returned = le16_to_cpu(r->num_returned);
st->num_remaining = le16_to_cpu(r->num_remaining);
return 0;
}
static int
iter_perf_levels_process_response(const struct scmi_protocol_handle *ph,
const void *response,
struct scmi_iterator_state *st, void *priv)
{
struct scmi_opp *opp;
const struct scmi_msg_resp_perf_describe_levels *r = response;
struct scmi_perf_ipriv *p = priv;
opp = &p->perf_dom->opp[st->desc_index + st->loop_idx];
opp->perf = le32_to_cpu(r->opp[st->loop_idx].perf_val);
opp->power = le32_to_cpu(r->opp[st->loop_idx].power);
opp->trans_latency_us =
le16_to_cpu(r->opp[st->loop_idx].transition_latency_us);
p->perf_dom->opp_count++;
dev_dbg(ph->dev, "Level %d Power %d Latency %dus\n",
opp->perf, opp->power, opp->trans_latency_us);
return 0;
}
static int
scmi_perf_describe_levels_get(const struct scmi_protocol_handle *ph, u32 domain,
struct perf_dom_info *perf_dom)
{
int ret, cnt;
u32 tot_opp_cnt = 0;
u16 num_returned, num_remaining;
struct scmi_xfer *t;
struct scmi_opp *opp;
struct scmi_msg_perf_describe_levels *dom_info;
struct scmi_msg_resp_perf_describe_levels *level_info;
int ret;
void *iter;
struct scmi_msg_perf_describe_levels *msg;
struct scmi_iterator_ops ops = {
.prepare_message = iter_perf_levels_prepare_message,
.update_state = iter_perf_levels_update_state,
.process_response = iter_perf_levels_process_response,
};
struct scmi_perf_ipriv ppriv = {
.domain = domain,
.perf_dom = perf_dom,
};
ret = ph->xops->xfer_get_init(ph, PERF_DESCRIBE_LEVELS,
sizeof(*dom_info), 0, &t);
iter = ph->hops->iter_response_init(ph, &ops, MAX_OPPS,
PERF_DESCRIBE_LEVELS,
sizeof(*msg), &ppriv);
if (IS_ERR(iter))
return PTR_ERR(iter);
ret = ph->hops->iter_response_run(iter);
if (ret)
return ret;
dom_info = t->tx.buf;
level_info = t->rx.buf;
if (perf_dom->opp_count)
sort(perf_dom->opp, perf_dom->opp_count,
sizeof(struct scmi_opp), opp_cmp_func, NULL);
do {
dom_info->domain = cpu_to_le32(domain);
/* Set the number of OPPs to be skipped/already read */
dom_info->level_index = cpu_to_le32(tot_opp_cnt);
ret = ph->xops->do_xfer(ph, t);
if (ret)
break;
num_returned = le16_to_cpu(level_info->num_returned);
num_remaining = le16_to_cpu(level_info->num_remaining);
if (tot_opp_cnt + num_returned > MAX_OPPS) {
dev_err(ph->dev, "No. of OPPs exceeded MAX_OPPS");
break;
}
opp = &perf_dom->opp[tot_opp_cnt];
for (cnt = 0; cnt < num_returned; cnt++, opp++) {
opp->perf = le32_to_cpu(level_info->opp[cnt].perf_val);
opp->power = le32_to_cpu(level_info->opp[cnt].power);
opp->trans_latency_us = le16_to_cpu
(level_info->opp[cnt].transition_latency_us);
dev_dbg(ph->dev, "Level %d Power %d Latency %dus\n",
opp->perf, opp->power, opp->trans_latency_us);
}
tot_opp_cnt += num_returned;
ph->xops->reset_rx_to_maxsz(ph, t);
/*
* check for both returned and remaining to avoid infinite
* loop due to buggy firmware
*/
} while (num_returned && num_remaining);
perf_dom->opp_count = tot_opp_cnt;
ph->xops->xfer_put(ph, t);
sort(perf_dom->opp, tot_opp_cnt, sizeof(*opp), opp_cmp_func, NULL);
return ret;
}